How to make so that at text input in ultraCombo the drop-down window with autocomplete variants?
I'm not sure I understand your question. The UltraCombo will auto-complete what the user enters by default. So you don't have to do anything to make it do so. If it's not working, it's because you must have set the AutoCompleteMode property and turned this off.
I want that autofilling was such as in a standard component comboBox at installation of property AutoCompleteMode in SuggestAppend. Neither in ultaCombo nor in ultraComboEditor I have not found property AutoCompleteMode, only AutoComplete, but it is established in true.