In the case a file is digitally signed, in most cases files would need need to have the certificate remembered rather than having the hassle of rechoosing the certificate from a set that can be very large every save which is a confusing process. Reproduction can be done as follows: 1. Create a document 2. Digitally sign it 3. Change something and try to redo the digital signature Currently, I will be working on implementing the option of remembering the chosen certificate for some file as an option to the dialog of choosing the digital signature. *Please note that this is a part of GSoC'23. More info here: https://tokiesan.github.io/blogposts/gsoc/index.html*
In addition, this issue is not only in digitally signing documents but occur as well in case of GPG encrypting a document.
TokieSan committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/46722dbaa7795074e3c5043a76ae3f3a7782491e tdf#155665 Adding option to remember signatures for each save It will be available in 24.2.0. The patch should be included in the daily builds available at https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.