Hello.
There are people who prefer the existing borderless window mode. We will guide you how to use borderless window mode as below.
1. Library - Right Click Dungreed - Properties
2. Click "Set Launch Options"
3. Type -popupwindow
4. Run dungreed
Using the above method, you can use Borderless windowed mode.
If you have any other questions, please leave a comment or a discussion!
Thank you.