Not sure what your shower looks like, but in my last camper I replaced the angled rod with a flexible one. This resulted in a bigger shower area, allowing me to take a shower w/o getting tangled up in the curtain the entire time.
As the above posters said, just a couple small holes left behind from the original mount brackets. You can fill them in with caulking or putty (although I didn't bother; you can see the holes in the 3rd pic)
2017 F250 Lariat Super Duty Crew Cab, 4x4, 6.7L Power Stroke
2016 Jayco Eagle HT 29.5 BHDS