Issue Description
In Archicad, holding the Shift key should typically constrain the cursor to 90° increments or align it with the construction grid/guide when drawing or editing.
Solution
If it’s not functioning as expected, here are some steps you can follow to troubleshoot:
Go to the Options > Work Environment > Input Constraints and Guides.
Make sure the 3 boxes highlighted in the picture below are checked.
If the cursor still fails to constrain then, reset the Work Environment.
- Go to Options > Work Environment > Apply Profile and choose a default profile like Standard Profile.