The Ruler.
ALT key.
Hold the Alt key
page layout
select page layout tabs & choose "margins".click "custom margins" to open the margins tab then in the small boxes (top,bottom,left,right and gutter)put in the measurment you need.
A word processing program like Microsoft Word or Google Docs is typically used to set tab stops, indent paragraphs, adjust column widths, and change page margins. These features are essential for formatting and customizing documents to meet specific layout requirements.
ruler
How to change default page margins in excel.
vertical ruler
The best way that I have found is to create a text box with no border in the margin, and type in it. Or are you talking about making comments in the margin? That would be done by using mark-ups.
You can set the margins of the page on the page layout settings You can set the margins of the page by dragging the edge of the ruler at the top of the page (you must have the rulers visible for this and the position of the mouse pointer to perform this task is very delicate. The pointer turns into a double-headed arrow at the border between the page's white ruler and the margins grey ruler (at least those are the colors in the default Windows color scheme you can change all of these too). If you miss you might put a tab where you release the left mouse button or you might set up the left indent for the paragraph or you might do one or two other things, as I said the mouse pointer position is critical for this operation.
If you're on Microsoft Word, go up to the ruler automatically present on your document. If your ruler/slide isn't there, go under "View" and check "Ruler" on. When this is done, you may drag (I suggest a few centimeters at a time rather than inches) your margins in (for making your text longer) or out (for making your text shorter) using the blue arrows at the top of the screen. If you can't figure this out through text alone, you can google screenshots of "ruler margins" on word. It should show you what the ruler is. Hope this helped!