thinkdesign 2016 model

[LoStranieroPazzo]

Hello, everyone! in thinkdesign 2016 sometimes disappears the bar to the left of the model structure. How do I get it back? then appears alone but sometimes it takes a lot of time and I can't work.
Thank you! ! ! ! !

 

[Techspell]

It's not very clear what's going on.

the model structure can be free, hidden automatically or permanently hidden.

to recompile it you can use ctrl+alt+d

in the menubar, under view -> document explorations find various options with which you can operate on the model structure