Got a '19 F150, XL, 5.0, 10sp. On the dash display there used to be a vertical column that displayed the gear selected. It is now gone. Did I somehow turn it off? Is something broke?

 

you can hit your up/down buttons on your shifter or just put it in tow/haul for a moment and they will pop back up

 

Try pressing the + button on the gear shift.

 

You went off the end....now it is lost!!

Like others have said hit the plus /minus button on the shifter.....

 

It is a 5.0 so it's probably broke judging by this forum. JK guys!

 

Yep, yes, agreed as others said, its the + button.
If you hit the - button you could potentially lock out one of those 10 gears.
.

 

Yep, also ask the dealer for the owners manual. Usually its in the glove box.

 

Owner's manuals are for pussies! I have you guys. Just drove South Texas to Vail, Colorado and back. Got up to over 10,000 feet. Averaged more than 20 mpg going out without trailer at around 70 mph. Coming back with trailer and Birkin Lotus 7 was probably getting 13 mpg average at 60 mph. Burns zero oil.

Birkin has Ford power, Duratec 2.5 with throttle body injection, headers, Crower street cams. Haven't had it to the drag strip yet but it should do mid 11s.

 

I just came back from a camping trip pulling a travel trailer (4500lbs + gear and such) and got just less at about 12.5mpg but I'm using a 2.7L as well. Pulled well and enjoying it.
I did use the "-" button to lock out 9th and 10th gear as it wouldn't sit well in 9th and would hunt between 8th and 9th with rolling hills. So just let it only go to 8th as the highest.

 

When I use tow mode my 10sp never shifts beyond 8th.