Just recently fired Postman back up and it's so different now. Finding it difficult to find my way around when all I want to do is just send a request.
I haven't used it as much in the last 3 years just because I've mostly been building APIs that expose a Swagger UI, but I definitely remember the UI being much simpler back then.
Have y'all moved on to different solutions? If so which ones are you using?
EDIT
I've been going through the suggestions, here's the list of suggestions in order of most times suggested or number of points on the comment:
I tried postman and came to the same conclusion as you. I couldn't figure it out at all. I downloaded an app for android called "ApI Tester". I might try out ThunderClient, which others have suggested, if it works on Linux.