Are you tired of struggling to enter fullscreen mode in Unity 3D game view? Well, you're in luck! I'm here to show you a quick and easy way to do it. Let's get started!

Step 1: Open Unity 3D and load your game project. Once it's loaded, go to the 'Game' tab at the top of the screen.

Step 2: In the 'Game' tab, you'll see a small drop-down arrow next to the resolution settings. Click on it to reveal the options.

Step 3: Now, select the 'Maximize on Play' option from the drop-down menu. This will automatically enter fullscreen mode when you press the play button to test your game.

Step 4: If you want to customize the fullscreen mode further, you can also go to the 'Edit' tab and select 'Project Settings'. Then, click on 'Player' and navigate to the 'Resolution and Presentation' section. Here, you can change the default fullscreen mode and other display settings to fit your preferences.

And that's it! With just a few simple clicks, you can easily enter fullscreen mode in Unity 3D game view. Now you can enjoy a more immersive gaming experience and focus solely on testing and developing your game without any distractions.

I hope this tutorial has been helpful for you. If you have any questions or need further assistance, feel free to leave a comment below. Happy game development!