Explanation of menu commands for a track.

Control b (b as in "blank") on a PC, or Command b on a Mac, will delete all figures from the selected instrument.

Is that what you were looking for?

Edit: I just double-checked, and it appears that the above procedure deletes figures from the selected instrument, but only within the selected container. Still pretty handy...I use it often.

On Mac Command+ b delete only the last created figure not all!

Clear deletes the phrase (all parameters). 

Cut does the same but copies it to the clipboard first.

Remove removes the instrument from the arrangement.

Clear deletes the phrase (all parameters). 

But it does that only for the currently selected container. Even if you make a multi selection of containers the "Clear" command deletes the phrase only from one container.

So, if you have phrases for that instrument in a lot of containers, it might be easier with these steps:

First create a new instrument track with the same sound (Command "New instrument with same sound"). Then delete the original instrument track with the phrases (Command "Remove").

This way you will end up with a new empty instrument track with the same sound as the original one.

It is rare that you need to clear phrases in many containers at once. If you do, the method suggested by juergen works fine. If you have customized the instrument (playing ranges, controllers), make sure you copy these properties over to the new instrument before removing it.

Removing an instrument is a light-weight operation. It does not also remove associated rack modules. 

On Mac Command+ b delete only the last created figure not all!

When I use Command+b, ALL symbols are erased from the selected instrument within the selected container. 

And Ctrl +B  gives problem with shrinking of trackheader too small and track becomes not accesible anymore 

 Yes, the track collapses (I wish it didn't.), but a double-click on the arrow at the right side of the instrument's header expands it once again. No big deal IMO. Anyway, I find it a handy function, but YMMV.

Only you can decide what works for you and what doesn't.

But if you double-click at the far right of the track header of the collapsed track, it will expand. 

EDIT: A double-click ANYWHERE in the collapsed track header will expand it. 

Figure is important but not the only parameter. Command-B ensures all parameters are cleared.

Thanks for the clarification. I'm usually so focused on figures that I hadn't noticed that.