Modify Element Settings
To modify element settings, move your mouse over an element until the outline appears and you see Settings appear in the right corner.
The available settings will vary depending on the type of element.
If the settings dialog doesn't show the buttons at the bottom due to the screensize you can drag the bottom right corner of the dialog to resize it.
There are a number of panes available along the lefthand side. The top pane is usually specific to the type of element - in the above screenshot it shows the menu options.
The remaining panes are generic across different elements.
Save element settings
After editing the settings click Save & close to save the element settings and close the Settings window.