How to make 800 x 600 game become full screen on laptop

I have a number of games that run in an 800 x 600 resolution. I have wide screen monitors on my PC and they scale perfectly to become full screen on my PC's but on my laptop the games appear in a borderless window. The window takes up approx 3/4 of the screen but it's not full screen. Is there a setting I can use to make the window full screen? and how do I do this?

My laptop is a HP Envy 2017 (i5-7500u model)
OS is Microsoft Windows 10 (64-bit)
Games are typically java games

Many thanks for any help


Mike

Change your desktop resolution or change the settings on the game to match the native resolution that it should be set at.

I tried that. The laptop has an option of 800x600 but the resolution looks higher than that. Anyway, the game still plays in roughly 3/4 of the available screen space. I tried all the other resolutions available but nothing seems to alter this. Is there an option like "stretch to screen" or "no, I really do want 800x600 full screen"?

Thank you for your suggestion.

Go in to the Intel HD Graphics Control Panel:
Desktop > Graphics Properties...
> Display > General Settings > Basic
Resolution > Scaling.
If you want full screen then it will be horizontally stretched because of the differing aspect ratios.
An internal Laptop screen may not have all the options of an external screen.