Howdy!
The System Requirements lists 128GB free. With any update, the game size may slightly change, due to new data. I have Dragonflight, WOTLK, and Classic Era all installed from an installation that is about 4 years old. (Just meaning I never did a fresh reinstall since) the client is about 132GB. My Data\Data was 111GB, Indices 20.4GB.
I can not find any known bugs related to unintended game size increases. Your file size is normal and within our system requirements. As for feedback to our developers on the size of the game, I recommend providing that feedback Here.
If you want to try to lower the size of the game the most here are some steps you could try:
- Other versions of the game share most of their data, but you could try removing them if you are not playing WOTLK or Classic World of Warcraft.
- Perform a full User Interface reset for each version of the game you have installed.
- Perform a clean install.
Thank you!