How can I delete the saves?

[m3yrr]

Even if I delete the saves file from the local file in ksp, it comes back on its own even if I delete the save data from the ksp menu.
Also, I have several saved data, but one of them is corrupted and I can't load the saved data because I can't see all the saved data in the menu.
How can I delete the saved data?
(Sorry if my english is wrong as I am using a translation)

[Poppa Wheelie]

Here's how I do it.  (Windows)

With KSP not loaded at all, or, if loaded, no further than the main menu:

1.  Make a copy of the entire game instance (I have several game instances active at once, managed by CKAN)
   1.  For example, I might copy from:  KSP Instances > KSP1 Career Game
   2.  And paste to:  KSP Backup Saves
2. Rename the copied save folder. 
   1. For example, rename KSP Backup Saves > KSP1 Career Game 
   2. To:  KSP Backup Saves > KSP1 Career Game 20230502
3.  Go to the location of your game saves
   1. Using the example above, my game saves would be at KSP Instances > KSP1 Career Game > saves > My Career Game 
4.  Delete all saves you wish to delete, which involves deleting two files for each save:
   1.  A LOADMETA File
   2.  An SFS File

If you start the game after this (or progress the game beyond the main menu), you'll see that the saves you deleted are gone.