As enclosed, go to Options/Configure Toolbar.
1. Select the Button to change.
2. Select Command associated with the button.
3. As an option, you can select a different Icon, or leave it the same icon as default.
4. Press "Change" to implement immediate change in Toolbar.
Tip: You can simplify the Toolbar by changing any command to a blank space by selecting "space" as the command - see enclosure.