How to mirror decals?

Greetings, how do I mirror the decals I made on let’s say right side to left side. I found out the basic way with +1 and -1 sliders,but how do you mirror letters and numbers, I tried to mirror them that way and they appear inverted.

redacted

You need to manually copy from one side to the other. if you are using the insert from right/left.

If you have space copy a few logos at a time, align over the inversed logo and then delete the inversed not required one.
If you dont have space, overlay a square (with a % of transparency), delete the inversed one and add the correct one where the square is placed.

[AB]