Thunderbird lists folders in the order that the user selects the setting. That is, if I want to show favorites at the top, then I go to the view>folders menu and UNtick current settings, then tick favorites and then continue with other folder settings as desired. The folders will now appear in folder pane in the order in which I ticked the boxes.

You can drag a folder to the position that you want.

Yeah, I've tried adding dropping copies of my favorite folders to the top of the folder column but as I scroll down, they scroll up and out of sight and while they were named the same, they were different folders. I want a favorites frame to stay put as it did with my desktop version of Outlook.

In Outlook, you can put your most used folders in a favorites frame that is stationary and always visible. If the favorite frames is going to scroll out of sight, why have a favorites folder at all? There should be a way to anchor the favorites frame in place so when I scroll down to other folders, my favorites are still there at the top and visible.

I see the last used folder is displayed at the top of the folder column but that doesn't help me. I want to keep a list of my most used folders there at the top of the column.

If you are willing to use userChrome.css, put the following CSS in userChrome.css. The following CSS should work for Thunderbird 140.1.1esr on Windows:

/* Keep Favorite Folders at the top of folders: */
#folderTree [data-mode="favorite"] {
  position: sticky;
  top: 0;
  background-color: white;
  z-index: 1;
}

Please see the attached image, which shows the user interface after applying the above CSS.

The simple, direct, UI approach: to the right of the header of each section of the folder pane, e.g., "Favorite Folders", are three vertical dots. Click on them to get a menu option to move sections of the folder pane up or down.

Oh, do you want to “freeze” the favorite folders at the top so that scrolling does not affect them? That is different. I defer to Yu5tiqX9og.

Yu5tiqX9og, thanks for your suggestion but programming is not one of my strengths. Can you give me step by step on how and where I'd add the code you mentioned?

Close Thunderbird.

Put the code in a text file. Name it userChrome.css. Put it in the folder called "Chrome" in your profile.

If you already have a userChrome.css file, put the code into that file instead of writing over the existing file.

Find your profile by View menu > Troubleshooting information > "Profile Folder" > "Show in [varies by operating system]"

Open Thunderbird.

I found my profile directory. I exited TB. There was no "userChrome.css" file in that directory. I copied the text provided and pasted it into a text editor, then I saved it to my profile directory. I wasn't challenged to overwrite any existing file which verified there was no userChrome.css file to begin with. After I restarted TB, I don't see any change. Under the +New Message button, the Favorite Folders line appears and scrolls up out of sight when I scroll down my list of folders - no change. Having just installed TB, I'm using version 142.0 (64-bit) on Windows 11.

Is there a setting somewhere I need to adjust?

Is there a setting somewhere I need to adjust?

Exactly the right question! Helped me find the answer.

Enable custom stylesheets in Thunderbird:

1. Open Thunderbird and go to Settings > General.
2. Scroll down to Config Editor and click Open Config Editor. Search for toolkit.legacyUserProfileCustomizations.stylesheets. Set this preference to true by double-clicking it.

By golly, I finally got it! I neglected to create the "Chrome" directory in my profile directory as instructed - fixed that! Then I moved the .css text file into that folder. At the same time, I opened the Config Editor and changed "toolkit.legacyUserProfileCustomizations.stylesheets" setting to "True" as Rick's instructions said and then restarted TB.

I'm a happy camper now! I want to thank all of you for your help. Yu5tiqX9og for the .css programming and Rick for the instructions that made it work.

I can now scroll down the list of folders and the Favorites Folders pane stays put at the top always viewable. This is great!