Yes, absolutely: there are several options for the dimensions.
When you draw a wall, if the Auto-dimension is activated (information bar on the right side of the screen), the length of the wall will appear in the floor plan. By selecting the wall, you can flip the location of the dimension line and text (if it is on the right, you can flip it to the left, or viceversa. If it is up, you can flip it down, or viceversa.).
If you prefer, you can deactivate the Auto-dimension and use one of the dimension tools (Edit Toolbar, on the left side of the screen). You can use the desired tool in order to customize the presentation. Also, you can use the Leader dimension (Edit Toolbar, on the left side of the screen) and customize the position, text, etc.
TFP, as any program, has a learning curve. The best way to learn the program, IMO, is practice + practice + practice => try to create elements not related with your project, so you will become familiar with the commands and how to develop the different components.
If you are interested, I have several training e-books, one of them is free. See links below in my signature.