You can adjust the size of the Stage in two ways:
Click + drag
If you click on the Stage's name, sizing controls will appear.
Edit property in the timeline
The first row in the timeline's properties panel is called "Main" and it affects the stage. From there you can manually input the value in pixels to adjust the stage size.
TIP: Use vector artwork if your design allows for it, so you can scale the published component to any size maintaining the same aspect ratio.
Note: Sometimes the stage size may accidentally be set in a future keyframe instead of frame 0, causing unexpected results when re-opening the project. Check if you have any keyframes set for
Size underneath your
Main component in the timeline.