This model does indeed have a manual thumb safety.

Hi Brian, the CPX-1 Gen 3 has an ambidextrous manual thumb safety.
Stay safe & have a great day!

yes it has a manual safety see ******** SCCY Industries CPX-1 Gen 3 Specifications and Features
SCCY Industries Item Number: CPX-1CBCRG3
Hammer Fired Semi-Automatic Pistol
Double Action Only
9mm Luger
3.1" Barrel
10 Round Magazine
Stainless Steel Slide
Rear Slide Serrations
Polymer Frame
Picatinny Accessory Rail
*******
*********Manual Safety
3-Dot Glock 43 Pattern Sights
Ambidextrous Manual Safety
Double Action Trigger with 9 lb Pull
Overall Height 5.26"
Overall Length 6.0"
Overall Width 1.1"
Overall Weight 15 oz
Color: Crimson Red and Black

Hi Brian and welcome. Yes, the CPX-1 has a Manual Safety. Cheers and stay safe!