Other settings

Topic	Explanation
Maximum amount of memory available to Sirius	Sets the maximum amount of system memory that can be used by Sirius. The default is 128 MB, but if your system has a large RAM, you may increase this value up to 70% of the total (in order not to interfere with the operating system and cause unnecessary swapping). Increased memory allocation allows for much larger structures to be displayed and manipulated.
Mouse responsiveness	Sets the default mouse responsiveness for the Structure Viewer. The higher the value in the slider, the greater structure movement will be in response to a mouse motion.
Undo options	Allows the user to enable/disable the undo function and set the number of undo levels. Note: undo function is based on saving states of the display before each change. Therefore, on systems with a low-performance processor or when working with very large structures, it make take a little longer for coloring, rendering or other changes. If that occurs, it is recommended to disable the undo function (unless its presense is necessary).
Color of loaded structures	When the default is selected, all newly loaded structures are colored by element. Alternatively, a sequential coloring scheme can be chosen. In this case, each loaded structure is displayed in a solid color. This can be useful when loading multiple structures or individual models from NMR structure or SDF files.
Application look and feel	Users can use this option to set application look and feel to either the Sirius default or to the OS-specific appearance. In some cases the latter may be preferred, since it sometimes produces better dialog and menu layouts.