Dock and Menu bar not fully appearing
Short question:
Dock and menu bar not appearing fully on display for M1 Mac mini with 2 Monitors connected (ACER CB281HK).
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Go to Apple > System Preferences > Displays > Display tab > Hold the Alt (option) key > click Scaled and try some different Resolutions.
If that doesn't help, then you may need to open the Acer on screen Display Menu and select a different Screen Size aka (Aspect Ratio)
For Display Arrangement tips, see > https://support.apple.com/en-us/HT202351
and > https://support.apple.com/guide/mac-help/change-displays-arrangement-preferences-mchlp1321/mac
It also might help if you take a screenshot using "Shift Command 3" or "Shift Command 4" and then post the screenshot back here using the Image Insertion tool for us to look at.
FWIW these are screenshots of my Mac Mini, dual displays with Sharks 3D in the background.
My Menu Bar, Dock, Safari and Drives are set on the left display.
Finder windows, Music (mini player), Photos and other Apps are set on the right display.