Editor Tab

Introduction

The Editor tab provides a real-time display of your selected element. Editing can be performed in the editor tab by grabbing and moving objects, size handles, and the rotation handle. The editor tab can be used to visually select objects by clicking on them.

Canvas Size

The Editor tab displays the canvas size with a dotted rectangle. The canvas is used for positioning and sizing instances which are placed directly in a screen (with no direct parent).

The Canvas Size dropdown has been added for the January 2026 version of Gum.

The canvas can be adjusted by selecting from the dropdown in the Editor tab.

Guides dropdown

Project Default

The Project Default guides uses the value as set through the Project Properties tab. For more information see the Project Properties page.

Customizing Canvas Size Dropdown

You can customize available canvas sizes by editing the .gumx file. At the time of this writing the customization must be done by hand.

To do this:

1. Locate the .gumx file for your project

2. Open the .gumx file in a text editor

3. Search for the CustomCanvasSizes tag

You can remove or add new sizes by making changes here. If the entire CustomCanvasSizes tag is deleted, Gum automatically re-creates the default set of tags the next time it loads the .gumx file.