The global preference for ZK Studio can be access by select [Window]/[Preferences] in Eclipse main menu.

Error Reporter
ZK Studio can upload it's error log to Potix to improve the quality and performance for future version of ZK Studio. check this to enable error log functionality.
This page is to configure some presentation style of Visual Editor.

Aut o restart visual editor if a project is failed to be hosting
The ZUL Visual Editor will try to restart if it failed to start at beginning, turn this off to improve the performance of ZUL Visual Editor.
Show border when mouse over a component
Check this to have a dash-line border for a certain component in preview result of Visual Editor when move mouse pointer over a component.
Show border on non-selected components
Check this to have a dash-line border on all components in preview result of Visual Editor.
Update frequency(ms) of VE
This setting controls the automatic refresh time for Visual Editor, set it bigger will let Visual Editor update it's rendering presentation less frequently, but will increase the performance of Visual Editor.
All the installed ZK Package in Eclipse will be listed here, you can select default ZK Package for used in creating new Dynamic Web Project. You can also add/remove installed packages in this page.

This page is to configure some options of ZUL Editor.

Use plugin build-in zul.xsd
Because the Content Assist feature requires a zul.xsd file to be functional, by default it will read the zul.xsd that is already included in ZK Studio, if this option is unchecked, ZK Studio will use the zul.xsd on ZK Website.
Enable auto content assist
If this option has been checked, then when you type in the ZUL Editor, the Content Assist will be automatically triggered to show auto-complete candidate list when you type the Auto content assist trigger, otherwise, you have to use keyboard shortcut to invoke the Content Assist when you're editing in ZUL Editor.
Auto content assist triggers
Set what character will auto invoke Content Assist in ZUL Editor, the default value is the same as Eclipse Java Development tools(JDT).