Click in the first item of the multilevel list. On the Home tab, click Multilevel List and then click Define New Multilevel List (yes, the command is misleading because you use it even for editing an existing list). Click the More button so that you see all options.

For level 2, make sure that "Follow number with" is set to "Tab character," select "Add tab stop at" and specify the desired value. If you want a hanging indent, also change "Text índent at" so that it matches "Add tab stop at."

Note that all indent values are measured from the left margin.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional