On the top of the design window, from left to right, are desktop/laptop/tablet/phone_landscape/phone_portrait.
Start on the left/desktop view, create your site, and move from left to right since you will probably have to make adjustments given the different size screens.
Please refer to
https://nicepage.com/doc/36215/basic-tips-to-build-responsive-websites
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Sincerely,
Allen R.
Nicepage Support Team
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