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