Change Of Format Of Opening Win10

[monP]

suddenly, by opening windows it presents only the new format (see annexe)

how can I return to the previous version, showing the entire elements onto the screen

 

[Trouble]

Can't tell much from the image that you've attached, perhaps you can generate and attach a better full screen image with either the snipping tool or by using the Windows Logo key combined with the Print Screen key on your keyboard.
In the mean time click the notification icon in the bottom right of your screen on the taskbar near the clock and try clicking Tablet Mode icon to toggle back and forth between tablet mode and normal mode and see if that changes anything.

 

[monP]

tks, I found the way