Is there some possibility to use the toolbar in the PCL project? And how can i use it inside this project?
If you check the documentation, the toolbar is wrapped into a cross platform Forms API.https://developer.xamarin.com/api/type/Xamarin.Forms.ToolbarItem/#memberlist
@NMackay , these links i read and i still am having problem. I need to change color and size of the Title and i'm not getting.
You need to implement customer renderers for each platform and adjust the layout, the default toolbar implementation in Xamarin Forms is a bit limited. I thought the platforms specifics API would improve the situation when it was 1st described to me but it just allows you some minor tweaks.
Really, you have to invest time in customer renders if your not happy with the out of the box basic features Forms gives for the toolbar.
In UWP you can override the theme, same with Android, it's a bit more code based with iOS, you'll need to investigate the specific platforms.
I use Android, just Android.
This might help, obviously you have to be using AppCompat.
You need to do some R&D.
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