Give more/less space to article tree, source pane or preview

Hover your mouse over vertical splitters, and then when the pointer changes in double horizontal arrow, drag left or right.

Give all space to the current element on the source pane

Click the maximize icon .

This give all space to that element and hides tree and preview.

To return to the split screen, click the maximize icon again.

Collapse the toolbar

Click the collapse icon and toolbar disappears.

To display the collapsed toolbar, click the expand icon:

Show entire page in the preview (only for linked articles)

Select the Show complete page in the toolbar above the preview pane. Wait until entire page loads. When the pointer changes in four-way icon, drag where you want to review the part of the page.

Click the zoom icons to zoom the preview in and out.