Why this street label is not visible even with zoom?
It has 'name' in it...
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It looks like the road is too short for the text to fit on, or it's too curvy. Check here for a similar solved question. A solution could be to either abbreviate the label, or simplifying the line might help.
EDIT: if you don't want to change the road then you could use rule-based labelling and create a new rule solely for that single label:
"name" = 'R. da Fonte do touro'
For that particular label I'd suggest setting the placement as below the line, offset by a slight distance. You could then also reduce font size to fit better along the line. Repeat or add other labels with similar issues.