It appears that your fill zone for the ground plane calls for rather large clearances. Try reducing the clearance to, say, 0.6mm or 0.8mm, re-fill the zone, and decide whether the results are acceptable.
(It may also help to reduce the minimum copper width in the fill zone to, say, 0.3mm or 0.4mm.)
It will probably be necessary to re-route the trace running from (U1, Pin 14) around the left-hand edge of the board. Re-position it to leave more space between the trace and the edge of the board. (Try for 2 - 3 mm.)
Make the "F.SilkS" layer active and use the graphic text tool.
See the KiCAD "Help" files, and search this Forum.