TWRP without touch is known issue.I flashed back to Jan OTA, followed all instructions all the way to installing Magisk, I still don't have touch in TWRP though. I can live without touch though so long as I can do what I need using ABD while booted into TWRP, I just want to make sure that I should still be able to flash Lineage now.
edit: so upon further investigation, I have no touch anywhere, not in TWRP, not in Android, nowhere. I just want to get everything back to bone stock and start over, not sure how to do that though.
To install Lineage OS, you should follow instruction from Lineage OS (using sideload)
here's the link....https://wiki.lineageos.org/devices/mata/install