If your Scheduler or other windows look strange, Icons look out of form you need to check your monitors scale.
Below are steps to change the Scaling in your monitor settings. Please let us know if this makes any difference.
1) Quit out of all programs.
Go to Start > Settings > System > Display
You should see a graphical layout of your monitor setup
2) Below the screen under Scale and layout you’ll see a drop-down menu labeled Change the size of text, apps, and other items
Set this to 100%, it is most likely currently on 125%.
3) At this point, Windows 10 may tell you that you need to sign-out and back in again before some apps on your PC respond to the new scaling settings.
Do a full shut down and restart of the computer.