TOOL BAR MISSING (ACROBAT STANDARD 2020)

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When I left my desktop for a long time (about 30min.),

My customized quick tools like comment tools are disappeared...

And the tool bars are reset as first start of the program.

How can I fix it?

I'm using the latest version of Acrobat 2020 Standard. (I entered a serial number to install)

Is there any possibility of conflict between Acrobat and Security programs like Symantec or Fasoo DRM?

My company IT department can't solve this problem now.. They didn't receive the problem report like that.