Hi @Lopez, Ahiezer ,
I want to confirm with you that you want to hide the save button which is the default edit form page in the classic list?
There are steps:
1.Edit page -> Add a Script Editor web part.
2.Edit web part -> EDIT SNIPPET.
3.Add follow codes :
<style>a[id="Ribbon.ListForm.Edit.Commit.Publish-Large"]{display:none;}</style>
The running result is shown in the following figure:

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