Word doesn't give you full control over the page layout. For example, each object (text box, picture, etc.) is anchored to a text paragraph on the page, and an object will always be on the same page as its anchor. What you can do is carefully anchor objects to paragraphs that are unlikely to move to another page.

To show object anchors, select that option in Office button | Word Options, Display category. You'll see the anchor for an object when it is selected. To move the anchor (if necessary), you can drag it with the mouse.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional