Set Visibility command (Edit-Tools > Visibility menu)

Opens a dialog to set track visibility for track blocks

View distance (blocks)

Sets how many blocks can be seen from the selected block(s).

Behavior

Set to selected view distance

Set block's view distance to the amount specified in View distance.

Set as minimum view distance

Set block's view distance to the amount specified in View distance as a minimum value for visibility.

Apply to

Actual block

Applies tool to currently selected block.

From start block to end block

Applies tool to range of blocks you specify in the Start and End fields.

Whole track

Applies tool to the entire track.