To show or hide completed matters, you will need to add the 'State' column to your matter list. To add the 'State' column, just look for the below-highlighted icon at the top right corner of your matter list.

A column selector will pop up, and you'll find the 'State' attribute near the top on the left - just drag it over to the top of the list on the right - then click Apply.
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The column should now appear on your matter grid, and you can then click on the 'Filter' icon to choose which state(s) you want to view.
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Choose the relevant options and click 'Filter'

Watch this short animation to see how to filter on matters that are Complete:

The list will refresh, and you can either update the existing view by pressing 'Save' or create a new view by pressing 'Save as.' To know more about Saved views, click here.

You can use this method to apply filters to any column of the matters list.