Tested on:
Windows 10 x64 with Thunderbird 68.0 (64-bit)
Windows 10 x64 with Thunderbird 78.0 (64-bit)
Windows 10 x64 with Thunderbird 91.13.0 (64-bit)
Windows 10 x64 with Thunderbird 102.2.2 (64-bit)
Linux with Thunderbird 102.0b7
NOT tested:
All other setups
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Warning:
Please be careful using this updated plugin. It can kill your Thunderbird account config.
Make a backup of your Thunderbird profile.
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This extension for Thunderbird 68+ adds a “Manually sort folders” entry into the Tools menu. Use it to, hum, manually sort your accounts and folders (that was obvious, wasn’t it?).
I sometimes put a development version online, but over the past eight years, I’ve only updated this add-on twice, as it is very stable; so your best bet is to just stick with the publicly available version on ATN.