A family of Microsoft word processing software products for creating web, email, and print documents.
Which version of Word are you running? Note if you have the web browser version (Word online), bulleted and numbered lists are not very stable.
In the desktop version of Word for Windows, to change indentation in single level lists, click the actual symbol (bullet or number) to select all numbers that belong to the list. Right-click and choose Adjust List Indents. (Trying to set the indentation using other methods, such as the Paragraph dialog box, will break sooner or later.)