The text editor that ships with Omarchy is Typora. That is a paid program. Replace it by a free one.

Replace Typora with Mousepad

There are many free text editors that you can use with Linux: Mousepad, gedit, Kate, Xed, Notepadqq, and many more.

My favorite one is Mousepad, but any of them is fine, as long as you do not pay for Typora.

sudo pacman -Rns typora
sudo pacman -S --needed mousepad