Hi Hideki MIWA,
To address your question directly, there is unfortunately no native way in Windows 11 Pro to randomly pick and choose specific, individual System Restore points for deletion. The Windows operating system intentionally restricts granular management of these snapshots to maintain system integrity. While you can open the Command Prompt as an administrator and use the command vssadmin list shadows to view the details and IDs of all current shadow copies, attempting to use the delete command on a specific ID will fail. This happens because System Restore creates these backups in a restricted security context that prevents manual, individual deletion through native command-line tools.
Instead of selective deletion, Windows offers only two native approaches for freeing up space consumed by these snapshots. You can erase every single restore point on the drive by navigating to the System Protection tab within the System Properties dialog, which is easily accessible by running sysdm.cpl from your Start menu or Run dialog, and clicking the configure button. Alternatively, you can remove all existing restore points except for the absolute most recent one. This is accomplished by launching the Disk Cleanup utility by typing cleanmgr.exe, clicking the option to clean up system files, and utilizing the System Restore cleanup feature located within the More Options tab.
Hope this answer brings you some helpful information. If it does, please hit "accept answer" to help others in the cummunity.
Domic V.