Protected section
You have the possibility to protect part of the code present in the body of the flows.
To do this, you must delimit the part you want to keep with the comments:
//PROTECTED_SECTION and //END_PROTECTED_SECTION
Here is the body present in this flow :

If you add "//PROTECTED_SECTION" at the beginning of the part to save and "//END_PROTECTED_SECTION" at the end, like this:

You can update your flow, the delimited part will be protected.
Here we have removed the parameter, the body is updated keeping the area protected :
