No Auto-Fit Option for Finder Columns. I am a big fan of the capability of Mac OS X to cleanly show the contents of nested folders using the Finder’s column view. The Mac OS X Finder column view is really handy, letting you see multiple folder contents side by side in a hierarchical view. But unless you set the default column width yourself, anytime you launch a new Finder window, the columns size will be reset on a per window basis. Mac OS X v10.5, Mac OS X v10.6 and Mac OS X v10.7 installed X11.app by default, but from OS X Mountain Lion (10.8), Apple dropped dedicated support for X11.app, with users directed to the open source XQuartz project (to which it contributes) instead. Keyboard shortcuts in Word for Mac. To finely adjust a column width, turn off snap-to functionality by pressing Option with the shortcut keys. To use this Office keyboard shortcut, you must first turn off the Mac OS X keyboard shortcut for this key. On the Apple menu, click System Preferences.

No key commands are available. You can select the table then use the 'Table Formatter':

Snipping Tool For Mac

These controls will apply to the items selected. If you have one column highlighted then you can change the width of that one column. If you select all columns then this control will apply to the selected columns.

Paint Tool For Mac

you can also hover the cursor over the dividers between columns (the lines in the header... the lines between, for instance, the 'A' and the 'B'). The cursor will change to a vertical bar with a horizontal line with left right arrows, then click and drag as needed. Similar for rows.