Image frames are, by default, magnetic. Two adjacent frames will pull together magnetically when being moved on the canvas, and will snap together. Frames that are snapped together will share snap lines on the ruler bar.
Spacing between snapped frames is controlled by the inset value. Inset is controlled on the Frame Border Editor.
Multi-select frames on your page to change their inset value all at the same time.
If the inset value is reduced to 0, then frames will touch at their edge. Increasing the inset will provide more space between frames that are snapped together.
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