The bug
The newly added slider "FS Resolution" (Fullscreen Resolution) in the video settings of the game doesn't have enough space with the GUI scale set to "Normal" and the standard Minecraft font, thus it intersects other sliders and buttons in the video settings.
Environment
Microsoft Windows [Version 10.0.15063]
Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz, 3.40 GHz
64-bit operating system, x64-based processor; 8.00 GB RAM
NVIDIA GeForce GT 630; GeForce Game Ready Driver Version 385.28
Java 1.8.0_144-b01 (64-bit)
Just a note: it does fit in gui scale normal and unicode font.