How do I change the keyboard back to normal size?

[Windows Central Question]

When the phone is in landscape mode, the keyboard is only half sized, how do I get it back to the default.

 

[Chintan Gohel]

When the phone is in landscape mode, the keyboard is only half sized, how do I get it back to the default.

I think it's long press the space bar or the 123 button, not sure which