How to make Thunderbird's Quick Filter settings permanent

Thunderbird's Quick Filter toolbar displays options to filter all messages of the current email folder in certain ways.
It allows you to only display unread emails for instance, which can be very useful if the client shows unread mails but you cannot locate them in the folder which happens sometimes when senders use incorrect dates.
There is more to it than that though. You may only show emails that you have starred, emails from people in your address book, or emails that have been tagged or include attachments.
While you can achieve some of it in other ways as well, for instance by clicking on the attachment column to sort by attachments, it is usually faster and convenient to use the Quick Filter toolbar instead.
You find a message filter embedded in the toolbar as well which gets confused with the email client's global search sometimes which is displayed just above it in the interface.
The message filter will filter messages of the folder that you are viewing in the client while the global search will search for matching mails across all folders and accounts.
Tip: If the Quick Filter toolbar is not displayed in Thunderbird, enable it by selecting View > Toolbars > Quick Filter Bar. If the menu at the top is not displayed by default, tap on the Alt-key to make it visible.
If you use a filter you may have noticed that the setting does not stick by default. If you switch to another folder, all filters that you selected previously are reset (you can select multiple filters, for instance to display emails by contacts that include attachments).
That's where the pin icon comes into play. If you click on the pin icon in the Quick Filter bar, all changes that you make become permanent.
This means that you can change folders without losing filters that you have activated before. Permanent means that they stick until you click on the pin icon again or change filters directly without clicking on the pin icon.
This works even across sessions. When you close Thunderbird and re-open it, filters are still set provided that you have enabled the pin functionality.

You said that Outlook isn’t your main email client, so which is your main one?
I think its thunderbird
It is Mozilla Thunderbird.
Awesome! This actually solved my problem… what a stupid bug.
If this is the same bug that I’ve encountered, there may be another fix: (1) hover over open Outlook item in Taskbar, cursor up to hover over Outlook window item, and right-click; (2) this should give you Restore / Move / Size / Minimize / Maximize — choose Move or Size; (3) use your cursor keys, going arbitrarily N/S/E/W, to try to move or size the Outlook window back into view. Basically, the app behaves as though it were open in a 0x0 window, or at a location that’s offscreen, and this will frequently work to resize and/or move the window. Don’t forget to close while resized/moved, so that Outlook remembers the size/position for next time.
THANK YOU Claude!!! I could get the main window to launch but could not get any other message window to show on the desktop. You are my hero!!!!
Solved my issue! 6 years later and this is still problem…
Fantastic. Thank you. Size did the trick.
This solved my Outlook problem, too. Thank you. :)
Thank you so much, this started happening to me today and was causing big problems. You are a life saver, I hope I can help you in some way some day.
You are a god – thank you!
thanks a lot…. work like charm.. :-)
Yah…thanks Claude. I’ve been having the same problem and tried all the suggestions…your solution was the answer. It had resized itself to a 0/0 box. Cheers
Excellent post. This had me baffled even trying to accurately describe the problem. This fixed it for me.
Thank you
Thanks a lot for the article. Don’t know why it happenend, don’t know how it got fixed, but it was really annoying and now it works :-)
Thanks a lot. I was facing this issue from past 3 week. I tried everything but no resolution. The issue was happening intermittently and mainly when I was changing the display of screen ( as i use 2 monitors). The only option i had was to do system restore. But thanks to you.
I’ve been tried to sole this problem for 12hours. Your comment about changing the display of screen helped me a lot!! Thanks!!
Thank you…don’t know why this happened but your instructions helped me fix it. Running Windows 10 and office pro 2007
Great tip! Thanks!
Worked for me, too – thank you!!!
It’s Worked for me, too
thank you very much!
I had a similar issue with Outlook 2013 on Windows 10 and this helped me to fix it. Thank you very much!
Thank you so much. Solved!
Considering you published this in 2012, incredible not been debugged by Microsoft.
Thank you again. M
This problem was faced by only one user logging to TS 2008 r2 using outlook 2010.The issue was resolved.
Thanks.
Great tip. Thank you!!!! If it helps, I had to use the Control Key and the arrow keys at the same time to bring my window back into view. Worked like a charm.
Thank you, this worked !!!!
Man, you are a fucking god. Thanks a lot, what an annoying bug!!
Awesome, this post solved the issue. Many thanks!