I also voted in Tarrant Co. in Euless, although I live in Grapevine (I hate driving up the fwy. into downtown Gpvn.).
I posted earlier that there was no separation of the parties. The choice of party ballot occurred at the check-in after showing the DL so they could verify my voter registration. The access code for the computer designated which party’s ballot would come up.
No way to tell which party others were voting for, as there were no separate check-ins or lines. Worked great!
At least 2 locations in Tarrant County (Keller area) had separate lines on Tuesday. Wife voted at one, I voted at the other later in the day.