Restore the intended Windows primary button
Choose Left for conventional mapping or Right only when intentionally using left-handed primary-button behavior.
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Separate swapped Windows button mapping from a failing mouse switch, onboard profile, or remapping utility.
If a known-good mouse also has reversed buttons, check Windows mapping; if the behavior follows one mouse to another PC, investigate that mouse.
Press each physical button separately and record the reported button.
Open Settings → Bluetooth & devices → Mouse and set Select your primary mouse button intentionally.
Test a known-good mouse on this PC and the affected mouse on another PC.
If the fault follows a programmable mouse, restore its supported default button mapping.
Choose Left for conventional mapping or Right only when intentionally using left-handed primary-button behavior.
Use warranty service when the incorrect raw button follows the mouse across PCs.
Do not open an in-warranty mouse; switch or PCB repair requires suitable electronics skills.
No. Reciprocal testing separates Windows mapping from mouse firmware or hardware.
Microsoft Support. Windows primary mouse button configuration.
Super User. Symptom evidence and cross-device diagnostic reasoning.