Hi!
Here's how to delete SF Symbols from your Mac:
Open System Preferences
Go to General and then Storage
Click the information ( i ) icon next to the storage of the Applications section
Find 'SF Symbols' and then click it
Click 'Delete'
Confirm deletion
Done
(These are the steps from MacOS Sonoma except System Settings was renamed to System Preferences, the steps might be a little different. Just keep in mind you have to go to the storage settings.)
Hope this helps