The lasso tool jitters when holding the Alt key to draw straight lines, and sometimes it loses control.

Hey, ​@YiiiTian. Welcome to the Photoshop Community. I’ll help you figure this out. Please share the system info from Photoshop Help > System Info. Copy & paste into a text document, then upload & attach here. 

Please make sure there are no stale preferences in your Photoshop. Go to the location of the preference folder below and rename it to backup.

• Windows 10/11: Users/[user name]/AppData/Roaming/Adobe/Adobe Photoshop [version]/Adobe Photoshop [version] Settings
• You can press Press the Windows key > Enter 'Run' > Enter %APPDATA%\Adobe
• Rename the Adobe Photoshop folder by adding a .old at the end. (Adobe Photoshop 2026 > Rename > Adobe Photoshop 2026. old), You can restore these preferences later if needed.(https://adobe.ly/4860qM9)
• Restart the computer.

These changes will provide a fresh start to Photoshop, much like a new installation.

Let me know how it goes.

Thanks!

Sameer K

(Type '@' and type my name to mention me when you reply)