First off we will never get TRUE anti-aliasing (MSAA) in Automation due to it using a deferred rendering engine, this means the AA in the game's settings, and third party solutions such as ReShade will only have Post-Process Anti-Aliasing such as SMAA or FXAA which don't really do a good job of removing the jaggies accurately, only blurring them.

What are jaggies? These guys.

See the jagged lines/stair step patters in the image there? Look around, you'll see it everywhere in your game, especially during building a car.

One thing we can do is downscaling, or "Supersampling" which is rendering the game in a higher resolution than our monitor, and scaling the image down. There are third-party options such as AMD VSR and Nvidia DSR, but I have not had luck running DSR with Automation, and it causes Windows to have some troubles, so avoiding these is best. Luckily for us Automation actually has downscaling built in! Under your graphics options you'll notice an option called "Resolution Scale" the maximum value we can set here is 150% which for 1080p means 2880x1620. We want to go higher to fight the jaggies. 200% is a good place to start, which would be equivalent to 4k (3840x2160).

The tweak for this is to edit your GameUserSettings.ini file.
This is located in
replacing <Username> with your Windows username.

The line you're looking for will be at the bottom under the section [ScalabilityGroups], change the value (The max 150% option in game) to a higher value. How high you can go with this depends entirely on the specifications of your computer. I for example am running a GTX 1070 and have no issues setting this to
Once you've made the change, save the file and launch the game. It's important to know if you change the setting in-game you will have to re-open the file and perform the change again, so be careful with your clicky fingers!

Enjoy editing in your super-smooth design room now!