HiddenItems

is an option for Dataset that specifies which items to hide.

Details

	i	hide the item at position i
	{i₁,i₂,…,i_n}	hide the items at positions i_k
	{…,iFalse,…}	show the item at position i
	{…,iTrue,…}	hide the item at position i

Positions can be patterns.
The position of an item can be read at the bottom of a dataset when you hover over the item.
If the left-hand side of a rule is not a list, the setting is applied to any position that contains the left-hand side as a key or index.
A pure function f that returns True or False can be used in place of any value. The setting is given by f[item,position,data], where data is the dataset's first argument.
Items can be hidden interactively by choosing Hide from an item's context menu.

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Hide a row:

Hide a column:

Hide all items whose position contains 2:

Hide an entire row with the exception of one item:

Hide all but one row and column:

Use a pattern in a position:

Hide items based on their value:

Hide items based on their positions:

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