Encountering issues with launching games in Full Screen mode on Windows 10 is quite common. However, most of these error cases can be easily resolved with simple and quick solutions as outlined below.

1. Adjusting Screen Display Mode
For some reasons, your screen might lose its original display mode and revert to an alternative one, causing images to shrink and games not to display in full screen. To address this issue, follow these steps:
In this article, Software Tricks provides instructions for configuring iGPU Intel HD Graphics, and similar steps can be followed for other GPUs.
Step 1: Firstly, you need to Right-click on the main screen of your computer and select the Graphics option, which in this article is Intel Graphics Settings.

Step 2: When the Graphics settings window appears, select the Display option to modify display-related information.

Step 3: In the Display Settings window, choose General Settings (1) and set the Scale Full Screen (2) mode. You will then see the option Override Application Settings (3); select this option to allow applications to set themselves to full-screen mode.
Once the setup is completed, select Apply to implement the changes.

2. How to Play League of Legends in Full Screen on Windows 10
The game League of Legends - LOL by Garena is currently played by many people, and the in-game settings will automatically adjust according to the computer configuration. If the computer configuration is identified incorrectly, you cannot play the game in full screen mode. However, you can manually configure it in the Game file.
Step 1: Firstly, you need to access the game storage folder on your computer to locate the game setup file.
This PC -> “Ổ lưu trữ Game” -> Garena -> “Tên thư mục Game” -> Game -> Config |

Step 2: Navigate to the Config folder where you'll find the Game.Cfg file. By default, Windows 10 might not display this file. To access it, Right-click on it and choose Open With…

Step 3: In the Open With window, select Notepad and click OK.

Step 4: Once the Game.cfg file is open in Notepad, scroll down to locate the Height/Width parameters – the game's display size. Adjust the Height/Width to match your screen resolution.

Step 5: In this scenario, assuming a Full HD resolution on your computer, set them to 1920 for Width and 1080 for Height.
Once done, select File -> Save As… to save your changes.

In this article, we've guided you through playing games in Full-screen mode on Windows 10. Best of luck with your gaming endeavors!