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Go to Tools > Options > Select the Units tab
Click on Reset Defaults button to set the defaults for your units to either Systems International or US Customary. See the red box in the picture below.
Below that you also have the option to set the default unit system for how new projects will be displayed. See the blue box in the picture below.
Click the cell for unit you want to change
Click the drop down arrow and select the appropriate unit
You also have the option change the decimal display precision in the column to the right of the unit column
Open the properties of one of the elements you want to change the units for
Right click anywhere on one of the cells that have the label of the property. See the red box in the picture below.
Click on the "Units and Formatting..." button that pops up
Open the appropriate flextable
Right click anywhere on the column header for the property. See the red box in the picture below
Click on the "Units and Formatting..." from the list
The units "Feet" and "US Survey Feet" can be similar but also may account for differences in element scale and reported pipe lengths. It is imported to make sure that you are using the correct units in the model to assure that results and scaling are accurate.
If you need to change the coordinates of a model from Feet to US Survey Feet, right-click on the X or Y coordinate in the element properties, select "Units and Formatting", and choose the correct units.