Go To => Design => Lot Properties => the default is 200'x 200' => change the dimensions as necessary.
Keep in mind that this will change the dimensions of the workspace => these settings are not the property lines (located in the Landscape tab)
TFP, as any program, has a learning curve. The best way to learn the program, IMO, is practice + practice + practice => Read and follow the manual (this is important), see the videos => try to create elements not related with your project, so you will become familiar with the commands and how to develop the different components.
Also, in order to narrow the problems described in your posts, I'd suggest to include the information regarding program name as well the version number (different programs include different features).