There are 2 ways to resize widgets on your dashboards:
First way:
1. Go into Edit mode on your dashboard
2. Grab the resize icon on the bottom right of the chart you want to resize and drag larger or smaller to change the size.
Second way:
1. Go into Edit mode on your dashboard
2. Hover over the 3 dots on the top of the chart you want to resize
3. Click Edit - this will open the edit widget lightbox
4. Select the chart size you want
5. Click "Edit Widget" to save the chart