The options are as follows:
Library Path provides a list of locations where the assembler will search for included source files. When locating files for the read or incbin directives the search order is to use the path of the current file followed by each path listed in the Library Path separated by semi-colon characters (;).
Push PC to stack when running program allows return address pushing to be enabled or disabled when an assembler run directive is included in the source file and the Run option is used. When enabled (default) the current Z80 PC value will be pushed onto the stack.
Automatically hide assembler output on success allows the Output window to be hidden automatically after a successful assembly, making it faster to build or test without having to click the OK button each time.