How can I disable form based on a submission limit?

I want to disable the form once I reach specific number of entries in integrated Google spreadsheet

Hello Hussain,

You can disable a form from the Form Settings based on a submission count.

This option will disable your form whenever it reaches the limit. You will get this error.

Here you can see how it shows on your forms list. Also you can see that it works the same way with spreadsheet integration as well.

Please check and let us know if you have further questions.

Thank you!

Great
The problem that the submission occur three times a week.
For everyone, the limit shall be limited to 20.
The current submission number is incremental.
...

It will only disable the form, but since the form is disabled, there would be no submission going through your spreadsheet. Let us what issue are you having with your form when enabling this limit?

Looking forward for your response.