Lets gather them all under this one roof so they can managed well and devs can see where they all are and hopefully fix them. :D
adding Bug 87589 - UI: add different shortcuts for navigating the LibreOffice file dialog
Adding Bug 78210 - Consistent behavior for FilePicker and FolderPicker dialog
adding Bug 95919 - LibreOffice File open dialog does not save column settings
Enabling LibreOffice's native/internal file picker has been deprecated from the UI in 6.0 (bug 114484) and no additional changes will be made to these dialogs other than stripping them down to provide basic functionality as it would be a waste of effort to try and make them competitive with the system picker.
The file picker can sill be accessed through Tools ▸ Options ▸ LibreOffice ▸ Advanced ▸ Expert configuration ▸ org.openoffice.Office.Common.Misc ▸ UseSystemFileDialog