Run the check
Record which button events reach the mouse button test before making a change; also note any browser Back or Forward navigation.
Use the current operating-system Mouse settings for a primary-button swap, or the exact mouse maker's supported app for a programmable button; save a screenshot of the chosen assignment.
Repeat the same physical presses in this test and the application that needs the shortcut, then restore the original assignment if the action is wrong.
Official reference: Microsoft Mouse settings and primary-button screenshot
Official reference: Apple Mouse settings and Secondary click
Read the result
A changed application action with unchanged browser button events can be normal when vendor software maps a button to a shortcut.
Limits and next step
This page cannot alter your mouse mapping, identify every vendor profile, or prove a silent side button is damaged.
Repeat the check after changing one setting or connection. Keep a record of what changed before deciding whether the device needs service.