Museums MUST rotate out exhibits periodically, or visitors don't return. Figures like Tubman and Douglass are regularly cited by conservatives as examples of historical heroes. Major museums each have THOUSANDS of artifacts. Even if they keep a particular exhibit, they rotate artifacts. This is so stupid. Out of the two of us, one, and that would be me, has studied and done this stuff. This is just good public history practice.
If there is an exhibit devoted to the presidency that covers impeachments, then Trump's name should be on there, as with the others impeached. Visitors are smart enough to discern between impeachments and to recognize the reasons behind each.
As for other exhibits, I have read about them and some are again immersed in the weird language and cult stuff that is endemic these days among credentialed nincompoops. Above all else, it is stupid business, because it appeals to a small strand of potential customers who are like you, and is unappealing to the masses. Just as I would ask if you've considered just being normal, I would say that the Smithsonian should just try being normal in its exhibits. None of the weird cultspeak and self-flagellation, white guilt and other crap that 80% of the country hates.