Use to the Compare tool to compare two drawing sheets. Click the Compare tab in the top right corner and select the drawing you would like to compare.
The drawings Compare tool is use to overlay two sheets over each other.
In order to use the tool, click the "Compare" tab in the top right corner. There you will be in comparison mode. From there, click the "+" symbol in the top right corner and select the sheet you would like to overlay. Togal will automatically perform a drawing comparison and show the differences in Blue and Red. Everything not changed will be shown in grey.
TIP
You can quickly toggle between both sets of drawings by hitting "T" on your keyboard.