1. You can uninstall the third-party classic start menu tool;
2. Modify the time-limited task manager of the taskbar through the registry. Press the shortcut key [WIN+R] to run regedit, open to Packages in turn, change the value of UndockingDisabled on the right to 0, and restart;
3. Reveal the classic start menu through registry modification. Use the shortcut key [WIN+R] to run regedit, open it to Advanced in turn, change the value of Start_ShowClassicMode on the right to 0, and then restart.