sarkarsarbani, I ran into this exact thing during my prep and it's a bit hidden in the interface.
After you finish a
GMAT Club Test or a quiz set, go to your
Error Log (there's a link in the top nav under your profile or under the practice tests section). In the
Error Log, you can filter questions by status. There's a filter option for "Not Attempted" specifically. That will show you all questions from that test that you didn't get to.
The other way to access this: go back into the test results page for the specific test you took. At the bottom of the results breakdown, GMAT Club usually shows which questions were skipped or timed out. You can click into each one to see the question and the expert solution.
One thing I'd add: for questions you didn't attempt because you ran out of time, it's worth noting those separately from ones you genuinely didn't see. The time management information is more useful than just knowing which questions you missed.
Hope that helps find what you're looking for.