Hi John. "Markers" has own font settings, and I think that it is independent of setting the whole drawing. For me "Markers" remember the last font modification . After restarting the program, I see that font in the "Markers" is so, like it remained at the closing of the program.
TurboCAD Pro 2016, TurboCAD Pro 2018
Laptop Asus i7 6500U, dual-core 2,50GHz, NVIDIA GeForce GTX 950M, RAM 12 GB, SSD 480GB
Windows 10 64 bit