Thanks for the report, and it is the correct forum.

The Library project will show the intellisense error you describe, as it does not know which board will be used (as libraries can be written for all architectures and boards), so the Intellisense information cannot be gathered at this point.  The vMicro ribbon also doesn't show for the same reason, as selecting a board could trick you into thinking the code is OK, though it would only be true for the board selected.

Once you have included your library in a Sketch Project, you can navigate to the library files from the sketch (either with go to source from the #include in the INO, or by using the [ur;=https://www.visualmicro.com/page/Show-Hide-Hidden-Files.aspx]vMicro > Show/Hide Hidden Files[/url], and opening it from the Solution Explorer tree).  This will then apply the intellisense information for the board selected in the Sketch Project, to the library project as well.

Let us know if this doesn't make sense, or if you need any further information/examples.