Selectize dropdown selectors are much much larger than needed

Steps to reproduce:

• create a livedata - I used the livedata generated for the Movies application from the default help application, using the useLiveData=true parameter
• for one of the list properties, click on the dropdown of the filter to select a value

Expected result:

• the dropdown list displayed is wide enough to fit the options

Actual result

• the dropdown list displayed is very large, larger than a 4k screen
  See screenshots
  
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This reproduces also on the Wiki Index livedata table.