XF 1.5 Optmization

[zTurko]

Hello,

I would like to know how to make this disappear: http://prntscr.com/icf189

And how could I optimize this: http://prntscr.com/icf21u & this: http://prntscr.com/icf2t3
Thank you in advance

My site: https://streamweb.fr/