If this option is on, WinCatalog will automatically adjust the width of the columns in the main grid view in order not to show the horizontal scroll bar. This option may be good if you have three or four columns to display, but it is better to turn this option off for more columns.
Configure here what should WinCatalog do if you perform a double click on the item. There are 3 options are available:
Show properties - WinCatalog will open Item Properties Dialog if you double click on an item.
Open in associated application - WinCatalog will try to open file in the associated application. This option is available for files only. Double click on folder will navigate inside the folder. Double click on non-file item will open it's properties.
Open in Explorer - WinCatalog will try to run Windows Explorer and navigate the physical folder which contain the file. This option is available for files and folders. Double click on non-file item will open it's properties.
If this option is on, WinCatalog will expand (open) all the branches for Tags, Contacts and locations. If you have a lot of tags, turning this option on may increase the startup time.