So when importing files there are cases when you want to delete a number of the solid bodies for instance. You can window them in the graphics window using the select bodies priority but then you can't delete them
https://forums.autodesk.com/t5/inventor-ideas/delete-solid-bodies/idi-p/4471601
So then you switch to select feature priority now you can't window but you can delete the features. So please either allow the deletion of solids or be able to window on feature priority or both. One way around this is to window on solid body priority turn the visibility off then delete the non-visible features on the browser. This is frustrating however as it is very common to need to remove bodies on an imported file.