I cannot see the complete numerical balance in the Balance column of my Check Register. Cuts off the last 2-3 digits. I am unable to expand the column width as usual.

In QuickBooks, every field within your company data file has a maximum limit of characters that can be entered, RoxButch. 

QuickBooks Desktop for Mac, the number of numerical balance figures that will appear in the balance column for the chart of accounts depends on your specific preferences and settings. By default, QuickBooks Desktop for Mac displays two decimal places for the balance column. However, you can customize the display format to show more or fewer decimal places or even hide the cents portion entirely. This can be adjusted in the Preferences section of QuickBooks Desktop for Mac.
 

You can refer to these articles for more details:

• General preferences for QuickBooks Desktop for Mac
• Character limitations for fields in QuickBooks

On the other hand, we are unable to expand the column width on the Chart of accounts as the system works as designed. 

Furthermore, here's an article to help you manage transactions inside the program: View and edit transactions in QuickBooks Desktop for Mac.

Know that you can always reach back if you have further concerns with QBDT for Mac. I'm always here to help. Have a nice day.