There is a problem with the minimum days between activities because the number does not appear clearly
https://postimg.cc/1gnnC7G2
(https://postimg.cc/1gnnC7G2)
Thank you for your report! But please consider attaching the picture here on the forum, as opposed to sharing a link on an external site; maximum size allowed for the attachments is 512 kb, but if other users suggest I could increase this limit.
Now to your problem: It appears on Windows 11 only, and I hoped only with Qt 6.7.0 and 6.7.1. FET latest version, 6.22.2 (and 6.22.1) use Qt 6.7.2, and the Qt team told that the exact bug you report has been solved in Qt 6.7.2.
If it is still unsolved, or you must use FET with Qt 6.7.0 or Qt 6.7.1, please start FET in the Fusion or Windows styles (fet-fusion.bat or fet-windows.bat - just execute one of these Windows batch files).