I've created a project, GATS for CIS, as below:
I've set up a quick filter for the newly created project as below:
However, it says "Issues may be hidden by Quick Filters" when I click the quick filter just created even though there are a few issues under the project.
I am not sure what the problem is here, or what you're asking. It might be easier to explain the principal in general, rather than wait for you to explain the question.
A board selects a load of issues from your JIRA system. Have a look at the board configuration, you will find a filter there which will be something like "project = X", or "project in (x, y, z)". That gives you a pile of issues for the board to work with.
A quick filter performs a more filtering on that list - it removes issues from the board display while it is active, to help you simplify the information in front of you. My guess is that you have missed the explanation of the quick filter in your screenshot where it says "further filter", and wrongly assumed a quick filter adds to the board.
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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