Tilda supports responsive design for all the basic screen types: 1200—max (desktops) 980—1200 (horizontal tablet) 640—980 (vertical tablet) 480—640 (horizontal smartphone) 360—480 (vertical smartphone)
This is enough for your design to display correctly on all devices.
After you have customized a Zero Block on the main artboard, switch the screen types and make adjustments where necessary, such as text column width, image size, font size, artboard height, or element layout.