Tutorial: Change Display Resolution
If you want to have higher display resolution, you can change it in the setting dialog. Click "Tools" menu, then click "Options", in the setting popup dialog, click "Display" tab. It looks like this:
After it is changed, the new resolution is used next time you load a model. The higher resolution you use, normally the slower the app becomes. Please note that not all 3D formats support resolution change, the typical formats with resolution support include STEP, X_T and IGES
The following two pictures show the difference between low and high resolutions. This is rendered with low (default) resolution:
This is rendered with high resolution: