MacBook Pro trackpad and mouse not dragging highlighted text

Relatively new MacBook Pro where the trackpad and apple mouse been working fine for a year then recently both stopped highlighting or dragging selected text. Have restarted computer several times, deleted the mouse and reconnected, and followed a suggestion in the existing community help responses to unselect the 'Force Click and haptic feedback' option in the trackpad settings. Both trackpad and mouse now will highlight a single word or the entire line but I still cannot drag the mouse or trackpad to highlight words or sections of text, and also it still will not drag even the highlighted items. Would appreciate advice if anyone knows how I can fix this. Thank you :)