How to add, edit and save columns in Downtime - English
Guide on how to add and edit columns in downtime
Adding additional columns to your downtime by right clicking on any of your column headers
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Select the Add Columns that has been underlined

From this point you cant add any new columns that are not already displayed.
To remove a column, hold left click on the column header you desire to remove and drag it anywhere else on the screen until a X apereas over the desired column header. Drop the column you want removed once the X appears.
After editing current view layout to your liking, see icons on the bottom of the downtime panel.

select the Icon with the red underline to save current view layout.