It seems that simply moving the app to Trash doesn’t remove the leftover files, is there any app uninstaller for Mac recommaneded?
You can try CleanMyApp, an app uninstaller for Mac. It automatically finds and collects the target app’s generated files while you uninstall it. You don’t need to manually search for the leftovers folder by folder and delete them from your Mac.
Yes, simply moving the apps to the trash doesn’t remove the files generated by the uninstalled apps. Those files will remain on your Mac and eat up the disk space. If you have already uninstalled the app, you can use some third-party cleaner for Mac such as iBoysoft DiskGeeker, it can scan the drive and collect the unnecessary files, including the leftovers of uninstalled apps, and then you can remove them.