Drawing tool visibility and display priority can be specified using the following options.
Show All Tools / Hide All Tools
To quickly show or hide all drawing tools which have been added to a view, select Show All Tools or Hide All Tools from the Tools menu.
Hide Individual Tools
To hide an individual drawing tool, right-click on the tool and select Hide Tool from the popup menu.
To re-display tools which have been hidden, select Show All Tools from the Tools menu.
Send to Back / Bring to Front
If drawing tools overlap, and you wish to display a tool "behind" or "in front of" other tools, right-click on the tool and select Send to Back or Bring to Front from the popup menu.
Send to Back (Behind Geometry)
By default, drawing tools are displayed in front of the model boundaries and data contours. If you want to display a drawing tool "behind" the model, right-click on the tool and select Send to Back (Behind Geometry) from the popup menu.
To re-display a tool in front of the model, right-click on a visible portion of the tool and select Bring to Front.
NOTE: the visibility status of drawing tools is saved when you save the file, so you should keep this in mind if you have hidden tools (i.e. hidden tools will not be visible when you re-open the file).