I’m still confused about coverage part of each and every line of the react code , how can i cover this lines?

How to make coverage of the uncovered lines with jest test in react, for example

**setShow && setShow(false)**; and one more scenario which I faced as uncovered 
and this type of scenarios   **if (fieldSelectOptions?.[0]?.options?.[0] && 'parentFormId' in fieldSelectOptions?.[0]?.options?.[0]) {** in this some cases i need optional check if i remove then the lines are getting covered otherwise it is not getting covered what should we do with this