
If you need to add new "Category" category - try to open Library settings then click on column named "Category" in columns section and look what the type of the column.
- If type is Choice
Click on this column and add new category
- If type is Lookup
Click on this column and look what is the name of lookup list
Click on Site contents(gear in the upper right corner -> Site contents)
Open lookup list
Add new item in this list
- If type is Single line of text
Just add new item in your library and fill new category value in the field "Category"
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