Assigned presets are not visible in the Preset Manager when settings window shrinks horizontally or divider line is moved

Steps to Repro:
1. Create a new project
2. Edit > settings
3. Preset manager
4. Shrink window horizontally or move the divider line to right

Actual Result:
1. Preset text overlaps the preset input field
2. Preset input field expands out of its designated place, resulting assigned preset unviewable

Expected Result:
1. Assigned presets should clearly be visible on shrinking settings window

Environment:
Windows and Mac

Occurring with:
2019.1.0a3, 2018.3.0b5, 2018.3.0a4

Note:
Unified settings window was introduced in 2018.3.0a4