"Metric to Collect" Field in PerfMon Metrics Collector Listener UI Doesn't Appear as a Dropdown Initially

[rangu9731]

Expected behavior

The "Metric to Collect" field should visually indicate that it is a dropdown, even before the user interacts with it, improving usability and user experience.

Actual behavior

The field looks like a plain text field until clicked, making it unclear to users that it is a dropdown.

Steps to reproduce the problem

Open Apache JMeter.
Add a Thread Group to the Test Plan.
Add a PerfMon Metrics Collector Listener to the Thread Group.
Observe the "Metric to Collect" field under the "Servers to Monitor" table:
The field looks like a standard text field.
Click on the field to reveal that it is a dropdown with multiple options.

JMeter Version

5.6.3

Java Version

openjdk 17.0.3 2022-04-19

OS Version

10.0.22631 Build 22631