Although Omber does not directly have a layer system, it offers similar functionality through its support of groups.

You can view your groups by opening the Objects List view from the Options menu.

The Objects List view gives you a quick overview of the groups and other objects in your drawing. Open it by choosing Objects List from the Options menu.

Instead of putting objects in different layers, you should put your objects into different groups. You do that by switching to the Select tool, selecting the objects you want to group together, and then choosing Group from the context panel.

By selecting the background objects and then choosing Group from the context bar, you can create a layer-like group for your background

Here we've selected the shapes of the apple in the foreground and group it together

You can name your groups from the Objects List view.

Select a group, and then change its name in the Objects List view. Here, the background is renamed to "Background Layer" and the foreground is renamed "Apple layer"

If you want to edit the shapes in a group or layer, you select the group and choose "Enter Group" from the context panel.

To restrict yourself to working within a single "layer," select the appropriate group and choose Enter Group

Then, you will still see all the shapes from all the groups, but you will be restricted to only working with the shapes from the currently entered group. You can quickly hide a group or layer by clicking on the eye icon beside the group in the Objects List view. Note: When working inside of a group, sometimes when you use undo, you will be booted out of the group and sent back to the main drawing. You will then have to reenter the group to go back to what you were working on.

Once inside the background group, it's possible to edit the background without affecting objects in other groups

This allows us to make a shadow behind the apple without worry about accidentally altering the apple