Enhancement: improve layout, button labels for custom fields dropdown

[shamoon]

Proposed change

Revamped:

Closes #(issue or discussion)

Type of change

• Bug fix: non-breaking change which fixes an issue.
• New feature / Enhancement: non-breaking change which adds functionality. Please read the important note above.
• Breaking change: fix or feature that would cause existing functionality to not work as expected.
• Documentation only.
• Other. Please explain:

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have included testing coverage for new code in this PR, for backend and / or front-end changes.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.12%. Comparing base (40db106) to head (c1c3ba4).

❗ Current head c1c3ba4 differs from pull request most recent head 0c47f66. Consider uploading reports for the commit 0c47f66 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #6362      +/-   ##
==========================================
+ Coverage   97.06%   97.12%   +0.06%     
==========================================
  Files         420      420              
  Lines       16893    16922      +29     
  Branches     1289     1256      -33     
==========================================
+ Hits        16397    16436      +39     
+ Misses        494      484      -10     
  Partials        2        2              

Flag	Coverage Δ
backend	95.94% <ø> (+0.12%)	⬆️
frontend	98.56% <100.00%> (-0.01%)	⬇️

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[github-actions]

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