Quote: "I'm new to this..."
And yet you took the forum name AGK. A bit cheeky.
For each platform (except for Android, I think, because I can't find where I set it for that) there is a file that needs to be updated first. And then you add the correct calls within the app.
For Tier 1 Windows, edit the setup.agc file and change the width and height.
For Tier 2 Windows, edit Core.cpp and set the values you want for DEVICE_WIDTH and DEVICE_HEIGHT.
For Tier 2 iOS, edit Core.m and set the same defines as for Windows Tier 2.
For Tier 2 Mac, edit CoreForApp.h and set App.m_DeviceWidth and App.m_DeviceHeight in AppInitCode(void).
Then, this is all assuming that you are going to be using virtual resolution instead of percentage, call agk::SetVirtualResolution(<your width as int>,<your height as int>
.
Cheers,
Ancient Lady
AGK Community Tester and AppGameKit Master