In the Layer List, you’ll find all the Pages, Artboards and layers in your document. You can reorder and rename all of these from here.
How to hide and lock Layers
To hide a layer, hover over its name in the Layer List and click the eye icon that appears. If there’s an eye icon 
next to a layer before you hover it, the layer is already hidden. You can also use ⌘ + ⇧ + H to toggle hiding and showing layers.
To lock a layer, hold ⌥, hover over a layer and click the padlock icon 
that appears. Click the padlock to unlock it. Or use ⌘ + ⇧ + L to toggle a layer’s lock on and off. When you lock a layer, you won’t be able to edit or move it.
How to use Pages
You can use as many Pages as you like in your Sketch document. They’re handy for organizing your work, as well as improving the Mac app’s performance with complex documents.
To create a new Page, click on the add button 
at the top of the Layer List, and give your new Page a name.
Click on the Page you want in the Layer List to navigate to it, or press Fn + ↑ or Fn + ↓ to jump between them.
You can also collapse your list of Pages using 
and use a drop down menu to navigate between them instead.
You can drag Pages to change their order, or Control-Click on a Page to duplicate or delete it.
Once you’ve created pages, you can drag Artboards or layers within the Layer List from one Page to another in the Pages panel.
How to use Artboards
Artboards 
are completely optional, but handy for creating fixed frames on the Canvas to create your work in. They’re especially useful if you’re designing for a specific device or screen size.
To create an Artboard, choose Insert > Artboard from the toolbar or menu bar, or press A. You can either click and drag on the Canvas to create a custom size Artboard, or choose a preset from the Inspector.
To save a custom size Artboard as a preset, click the Add button 
at the bottom on the Inspector and give it a name.
After you create an Artboard, you can press ⌘ + D to duplicate it.
How to move Artboards
To move an Artboard, you’ll need to select it. If it doesn’t have any layers inside it, you can click anywhere on it. If it does, you’ll need to click its title on the Canvas, or select it in the Layer List. You can then drag it around the Canvas, use the arrow keys to move it, or change its X and Y values in the Inspector.
How to resize Artboards
To resize an Artboard, select it and then click and drag on the selection handles that appear around it. You can also edit its dimensions in the Inspector.
You can also set an Artboard to resize its contents at the same time by selecting Adjust contents on resize in the inspector. You’ll need to make sure you’ve set up resizing contraints for the layers within it first, though.
Finally, you can set your Artboards to automatically resize to fit their contents by selecting Fit in the inspector.
How to delete Artboards
To delete an Artboard, select it and press backspace on your keyboard. Doing this will also delete any layers within it. If you want to keep an Artboard’s contents but delete the Artboard itself, select it and choose Ungroup 
from the toolbar, or press ⌘ + ⇧ + G.
How to search the Layer List
If you have a document with lots of layers, you can use the search bar 
at the top of the Layer List to find a specific layer type. You can also use the search bar to find a layer by name.
Tip: Layers with long names will be truncated in the Layer List. Hover over any truncated layer name to see it in full in a tooltip.