Change the unit of measure name and abbreviation.

I got your back, @mkcho. I'll walk you through switching back your unit of measure (U/M) in QuickBooks Desktop (QBDT).

You can assign only one unit of measure for each item with a single unit of measure. However, with multiple units of measure, you can purchase items in one unit and then sell them. This implies that you must buy and sell the item using the same U/M. To start switching it according to your preferences, please refer to the steps below:

1. Go to the Lists menu, and select U/M Set Lists.
2. Select the U/M item you want to make changes to.
3. Under the Default Units, select which section you want to alter, it can be the Purchases, Sales, and Shipping section.
4. Hit the dropdown arrow to choose from the available units you want to change it with.
5. Then, click OK.
   

Moreover, get familiarized more with using single and multiple units of measure for items in this article: Use single and multiple units of measure for items.

It'll always be my pleasure to help if you've got questions other than the unit of measure. I'll be more than happy to assist you again.