The quick access menu is highlighted in red below. The quick access menu is also accessible from any tab you're on, so it contains all the options you might want to use at any stage in building and analyzing your simulation.
From left to right the buttons do:
Options to minimize, maximize and close Simul8.
Open Recent File
Takes you to a list of Simul8 files you have opened recently.
Save the changes you've made to your simulation.
Revert the changes you've just made.
Redo the change you've just undone.
Starts a single run of your simulation. When your simulation is running this will change to a pause button so you can stop it any time.
Resets the simulation back to time zero.
Step the simulation forward one event at a time. The shortcut Ctrl F8 can also be used to do this.
The Simul8 Assistant monitors your simulation building and the way you are using your simulation to provide advice to help you get it right.
Show Routing Arrows
The routing arrow button allows you to toggle on and off the display of your routing arrows between objects. Click on the drop down arrow to also access option to toggle on or off Resource Routing Arrows