Add Mesh () button is overlapping with Material field for the Particle system.

In the particle system, for the Renderer parameter, for Mesh Renderer Mode, Add Mesh () button is overlapping with the Material field in the inspector window. Refer attached screenshot.

Steps to repro:
1. Create a New Project.
2. Hierarchy > Effects > Particle system.
3. Particle System > Inspector > Renderer > Renderer Mode > Mesh
6.Observe Add Mesh () button is overlapping with select Material filed

Actual result:
Add Mesh () button is overlapping with Material field.

Expected result:
Add Mesh (+) button and select Material field should be well separated from each other.

Reproducible in:
2021.2.0a15, 2021.1.6f1, 2020.3.7f1, 2019.4.25f1, 2019.4.0f1

Working fine in :
2018.4.34f1

Environment:
Occurring on Mac 11.2.3 and windows 10