itch.io

You can disable the item size scaling by going to the model options in the object manager, although unfortunately I think you'd have to do that for every item individually.

If your issue is that the outline TITS shows is different for each model despite them looking about the same size on screen with version 1.2.2.3 (apparently only available through the new launcher for now) you can use the model calibration option in the VTS connection settings, TITS will save the setting per model so you can have the outline match whichever model you use without having to fiddle with the scene settings.

In my case TITS does work with Proton (for now at least), the easiest way is to download the zip version, extract it somewhere, then add it as a non-Steam game and enable Proton for it.

The new launcher works as well, although its UI when it's downloading the latest version looks glitchy.