Hi,
The regions tab is not applicable when viewing filters that have dataset sharing set to all datasets (you can see this in the Sharing tab of the same panel). this is done since the ‘regions’ tab is a check box to filter out regions of a dataset, these are not applicable to other datasets. It is for this reason we only allow advanced filtering for resources and activities on global (all dataset) filters too.
For the import button being disabled, datasets are only importable when they are a global filter which has the permission to be shared with the user (this is again in the sharing tab of the panel). This will also only show if the user has not already imported the filter. In the screenshot that you have shared none of the filters will be importable since the ‘show all’ button is set to false so all the filters in that list are already available to the dataset you are on. Depending on the version you are on if you select the ‘show all’ button two built filters called ‘TimeZone exact’ and ‘TimeZone plus’ will be available to import to give an example of what an importable filter is. However, I imagine since you are using a lot of filters there will be another example from another user to import anyway.
Thanks,
Reece