Android Studio Ladybug 2024.2.1
I intended to use a dark theme like Dracula, and then use:
-> A bigger font type, size & style like Fira 20
-> Make font colors brighter like White(FFFFFF)
There are useful Answers above that will help you change the bigger font size & style. Thanks to all.
To change the color of fonts in Editor, took me a while to figure out.
Editor -> Color Scheme -> Kotlin -> Classes & Interfaces
So as a first step I duplicated the scheme with the icon near the Scheme. Then for every component ( Class, Enum, Semicolon etc) unchecked the 'inherit values from' box. Then selected the 'Foreground' box and changed the color to FFFFFF.