Setting a left tab for a modified-block style letter can be accomplished in a few simple steps.
Step 1:
From the ribbon under the home tab, click the arrow to expand the paragraph dialog box.
Step 2:
Once you have opened the paragraph dialog box, click the tabs button in the bottom left hand corner. This will open the tabs dialog box.
Step 3:
Once you have expanded the tabs dialog box, enter 3.25 into the default tab stops text box. Next confirm that the alignment is set to left. After you confirm your alignment, press the set button to apply your tab. Finally, press OK and then press cancel.
Step 4:
Now that you have set your default tab stop, simply press the tab button on your keyboard whenever a tab is necessary in your document. Below is an example of what a 3.25 tab stop will look like.
