I would like to display the preview screen in the center.
However, some previews are display on the left.

devices of a preview screen on the left;
android5,6
android71gmailapp
android8gmailapp
androidgmailmap
AndroidOutlook
Android Samsung6,7
gmailios
I Pro13Pad10p5
Outlookios
iphone7,7plus, 8,8plus, se, x, xr, xs, xsmax

Please improve to display the preview screen in the center.