@alexaudio10
The GUI resize option is in the CustomSettings Floating Tile.
CustomSettings Floating Tile can't be saved in a preset. The value is stored in the GeneralSettings.xml file of the project in appdata folder.
So firstly, you need to modify the scale factor with this: SCALE_FACTOR="0.75" in the GeneralSettings.xml of your project.
Then in order to make this by defauly, you need to distribute the modified GeneralSettings.xml file (with SCALE_FACTOR="0.75" modification) to the appdata folder, with the installer. So while installing the plugin, this GeneralSettings.xml file will be created before the plugin initialization and plugin will start with SCALE_FACTOR="0.75".
In short, Because of above procedure is grueling; I recommend arranging the GUI smaller by default, so even in 100% scale, the GUI will be smaller on init :)