Currently the calibration of an object (the 3x3 grid in the property bar) is a global setting. Each object should have it's own calibration as its property, not as a global setting.
Depending on the configuration for decimals or scale of the graphic, sometimes the values in the X/Y fields are too small for a lot of digits. Make the fields larger so that all of the numerals can be seen without clicking and cursoring.
When I work with B-Spline, Polyline or 3-Point Curve tools. then the mouse wheel does not change the scale of the image. This reduces the accuracy of drawing. Please fix it!
May I recommend a “PDF Import Wizard“ - Filetype analysis - Page size & format - Number of pages A simple step-by-step approach like this would, I believe, be widely appreciated. Background: I dragged two PDFs onto a new blank document, the 'I...