How do I save a set of filters so I don’t need to recreate them every time?

As an example, try creating a blank Last Name, First Name search filter in one of your reports views (in this case, in Learner Activity, but it works anywhere). This will enable you to quickly search for users by name.

Click on the filter next to Last Name. Select Last Name + Contains and leave the search field blank, then hit Add Filter. Do the same with the First Name filter. You will now have a filter that looks like this: