Hi @LP
According to the link, in Version 2502 (Build 18526.20144), Microsoft fixed an issue in OneNote where ink does not appear until user lifts the input device such as stylus or mouse.
It is recommended that you try other versions to test this issue.
You may update to the latest version: Version 2502 (Build 18526.20168) via clicking to File > Account > Update now.
You may also try to roll back to older version, such as Version 2501 (Build 18429.20158).
- Press Win + R key together.
- Enter the command
"C:\Program Files\Common Files\microsoft shared\ClickToRun\officec2rclient.exe" /update user updatetoversion=16.0.18429.20158
.
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