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If I understood you correctly you want to remove options 1,2 and 3 from Friday, Saturday, Sunday.
You can do that inside of your form builder by selecting those fields and then click on Options and simply remove those options.
When you do that there will be only one check box with no label inside of your form.
Here is a demo form I made form your form with applied changes:
You can clone it if you want to inspect changes I made.
Hope this will help. Let us know if you need further assistance.