Validations for visible QRTs

Hiding a worksheet will not exclude it (in general) from Tabular processing. So when you will run validate Workbook, then hidden QRTs will also be validated.
But there are capabilities to allow users to exclude hidden sheets in the Validation report.

To do that go to the Validation report in the Tabular ribbon and select Visible QRTs -> show only errors of show all tests.

After this validations will run only on those QRTs that are not hidden.