How To change interactive column width:

1. Add static id to interactive report eg. myReport

2. Add static id for column in report eg. myColumn1

3. Add to inline css of page below code:

myReport td[headers=myColumn1]{ width:100px; }

Note: before myReport td put #

#ex td[headers="column"]{ width:100px; }

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You should try this using Column Formatting and set HTML Expression value like this

<div style="display:block; width:200px">#COLUMN_NAME_OF_REPORT#</div>

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