Missing widgets bar/docker

[AC Question]

Hello, It seems I have missed the option for adding widgets on Android 5.1, maybe I touched on the wrong place. Now, when I long tap over home screen I get nothing but a white rectangle that allows me to move the clock and the bottom icons but nothing about adding widgets. I remember I had the widgets option but I somehow missed it. Device has installed a few apps (firefox and rss raeder) and uses the stock launcher3 (I already tried to clear data an cache with not avail). Thanks for tip you can give me!