Add web parts to your page and share ideas through text, video, images, and more.
Add columns to a page
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Select Edit section.
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Choose a column layout.
Add additional web parts
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Move your pointer to where you want another web part to appear, and select the plus sign.
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Select the double-headed arrow to expand the tool box and see more options like Bing maps, File Viewer, and Office 365 video.
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To find a specific web part, type it into Search.
Source: Microsoft