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1

Open the log folder

Click Settings -> General -> Help -> Log file -> Show file. The folder with desktop.log opens.Or: Settings -> General -> Diagnostics -> Open folder.
2

Repeat the problem

Do whatever breaks it.
3

Send desktop.log

File too big? The part from the last SESSION STARTED line to the end is enough. Where to send it

Open the folder by hand

Press Win+R, paste the path and press Enter:
It must be %LOCALAPPDATA%: there is no log in %APPDATA%.
Tokens and session IDs are hidden in the log. Your computer user name stays in file paths.The app has no console or F12, so you do not need a console screenshot.
This is the previous log. When desktop.log grows past 5 MB, the app renames it to desktop.old.log on the next start. For a fresh problem you need desktop.log.