Came across a EX90 unit with a touch panle unit that does not have the option/button for Presentation. The only options there during an idle state are Call and More...
Could this be a setting in the Advanced Configuration Settings that would enable or disable this option? Search through the site here to see if there was something related and didnt find anything.
At verion 5.1.4
If you are not on call you do not need to share any presentation, reason why you do not have any tab for sharing when system is on idle.
The presentation tab will show when you are on call (point to point or multisite call).
Also make sure you are having your sharing content connect to DVI or HDMI source of the EX90 to use presentation.
If you want to use EX90 display as PC screen then connect PC using presentation cable and activate the Dual display from PC : Function + F7 or other combination as per PC config .
The presentation will be on the screen automatically when the EX gets a in source.
You can use the buildt in windows function easy display switcher to get picture out from your computer. Press and hold the "windows key" and press P to get the easy display switcher up, and toggle P for the mode you would like to be activated.
EX90 will automatically display your presentation input when it receive-signal.