I don't use it but I believe you can change the display style and some size of clock to choose from on GOODLUCK app but it's unavailable rn during beta.
It's not possible on the main settings, but again, if you use GOODLUCK and open clockface, you can set it; however, you like also use your 2 fingers to resize the clock thats the other way
As @Rosekh mentioned, you can perform this in clock face inside Good lock app. while applying clock face you desire, press pencil icon instead of tick mark icon. On top section, pinch to zoom the clock to your desired size. Although exact dimensions cant be altered individually, you would be able to change size to some extent.
