Drawing shortcuts
Enter: finish a linear or area measurement. You can also click Finish.
B: turn on Draw boxes for rectangular measurements.
Shift (hold): keep lines straight.
Control (hold), on Mac or Windows: temporarily turn snapping off.
Command + Z / Ctrl + Z: undo.
Command + Y / Ctrl + Y: redo.
Delete / Backspace: delete a selected measurement.
Shift + Click: select multiple items.
Add to an existing measurement
Use Add line or Add area in Properties. For separate linear runs, choose Separate segments: each pair of clicks creates a run.
Recover your view
Use Fit to bring the whole sheet back into view, then adjust the zoom.
Find the full shortcut list
Open Help in the drawing workspace and choose keyboard shortcuts. Use that list for commands specific to the current tool or mode.