EV3 software with large blocks
https://www.lego.com/en-us/themes/mindstorms/downloads

Scroll a bit down and you'll find two apple icons.



The left one will work for macOS 10.15 (Catalina) or newer, and is with what you describe slender blocks. It's similar to the Scratch educational programming environment.
The software is "pre-release" so might still have some kinks in it.

The right one is the older software with the blocks you are used to.
HOWEVER it will NOT work on macOS 10.15 or later.

Rather than porting their existing application to 10.15, LEGO has decided to spend their resources on the new app. Unfortunate decision in my opinion.