Dear hieu nguyen
Thanks for reaching out! Welcome to Microsoft Q&A. I'm Haien from Microsoft Q&A.
I understand how frustrating it is when your mouse isn't working as it should. Your English is perfectly understandable, so please don't worry about that at all! From your description, it sounds like the problem is with the mouse itself, rather than a Windows issue, especially since you've already tried resetting your PC. The way the left-click sometimes works and then causes the app icon to get smaller is a classic symptom of a faulty physical button.
To sort you out, could you let me know what is your Windows version (Windows 10 for Home or Windows 11 for Home)? In the meantime, you can try these effective workarounds and let me know anything news with each step:
- Test the Mouse on Another PC > Try a Different USB Port or a Different Mouse
- Press the Windows key + X and select Device Manager > Expand the Mice and other pointing devices section > Right-click on your mouse (e.g., "HID-compliant mouse") and select Update driver If that doesn't work, right-click and select Uninstall device > Restart PC
- Search for Mouse settings in the Start menu and press Enter > Select Additional mouse options > In the Mouse Properties window, go to the Buttons tab and uncheck the box next to Turn on ClickLock.
For additional information about similar situation, please visit this article: Mouse and keyboard problems in Windows - Microsoft Support
Please keep me updated with anything new that you were try to each option.
To assist others who might have similar questions and to help us improve our support system, we kindly encourage you to "Accept the answer" if it successfully addressed your concern. Accepting an answer lets other users know that this solution worked for you, and it also helps us track the effectiveness of our support efforts.
We appreciate your patience and look forward to resolving this quickly for you.
Warm regards