Hmmm. My spindle uses port 5.
If you first do a TR, then click on the word "RPM" in the window, you get the text edit form up where you can change things. I noticed on your screen shot that the "Start when SB starts" is set to "0". Set it to "1" if you want the RPM window to open automatically.
Just went through a computer refresh for my 3.6.38 software version so it's fresh in my mind.
One thing that was a good idea for me and might be for you too is to go through all the SB setup screens and take pictures of the data. That way you have an independent record of your settings that won't require you to save an SD card, paper printouts or anything else. It took me a few minutes to find them as I did it years ago but they were in my Google Photos online. Great thing to have.
ShopBot Details:
2013 PRS 96x60x12 (Centroid upgrade)
4hp Spindle
12" indexer
Aspire
Rhino
Fusion 360
Ferrari 360
Prusa MK3S+
Prusa XL multi-tool