If you come across a grant you know will never be a good fit, you can hide that opportunity from not just one project, but all of your projects on Instrumentl.
Navigate to the bottom right corner of the opportunity, click on the three vertical dots, and choose Hide from all projects.
To access opportunities that were Hidden from All projects, scroll to the very bottom of your left hand project navigation, and click on the tab Hidden from All.
If needed, you can unhide any grants from Hidden from All by clicking "Save" on the opportunity, bringing it into your Tracker.