Operating system: Ubuntu 18.04.1 LTS
Graphics card: GeForce GTX 750 Ti/PCIe/SSE2
version: 2.80 (sub 43), branch: blender2.7, commit date: 2019-02-01 22:37, hash: a3bf8da8758f, type: Release
build date: 2019-02-02, 01:03:21
Short description of error
In my screen resolution (1280x720), when using the fill tool in gpencil the properties of it disappear from the upper bar. This does not happen when:
I increase the screen resolution.
Decrease Resolution Scale in the blender properties.
Exact steps for others to reproduce the error
Open blender in 1280x720 resolution
File > New > 2d Animation
Select the Fill tool.