fix(SILVA-562): fixing search result size and value

[paulushcgcj]

Description

• Make the disturbance date column visible by default
• Use the date format provided by Atlassian for dates
• Fix the items per page of the opening search to be 20 items per page.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist

• I have read the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have already been accepted and merged

Further comments

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Thanks for the PR!

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