Column Width

Is it possible to set the column width as part custom themes? Given the new layout of the Base Sheets (which I love btw), I prefer to have column B quite wide and the then remaining columns up the start of the time series at the same width - is it possible to set this as default for new workbooks?

Hi guys

Watching videos at your channel at YouTube - great learning tool! Have a minor question - when I am trying to adjust column width at worksheets by pointing mouse between column letters (in A1 ref style) - it doesn't change from Thick downward Arrow to Vertical bar with small horizontal arrows. Is it something in my computer or deliberate or some glitch?