Hi,

Which .h files are you expecting to see? Ones that exist in the sketch folder or library/core? 

Which ide are you using?

Thanks

ps: You can add whatever you like to a solution, the compiler will compile what is valid for arduino regardless of the solution

Oh okay so you do not have a problem seeing the sources of the sketch but you want to see the arduino core and library sources.

It is too confusing for most users to have the core and library sources in the project and might lead less experienced users to attempt to edit them.

Obviously F12/Goto definition will take you to the sources and as you rightly report by default vs just shows the .h files in the dependency list

Visual Micro also provides a menu item called Project>Show all sketch sources will will link all core and library sources for the current board into the project. Click the menu a 2nd time to remove the sources again or remove them yourself.

Once you have added the sources to the project using the menu you should find that Visual Micro detects the fact and keeps the sources in sync with the selected board and also when adding new libraries.