What is the correct position on the issue of moving the finger in prayer? And is it better to move it or not to move it as a precaution?

This issue, like other matters of knowledge, is such that whoever finds a particular opinion clear should follow it, and whoever does not find an opinion clear should emulate someone whose knowledge and piety they trust. The matter does not warrant anxiety, for one who emulates someone whose knowledge they trust among those who advocate for its desirability or undesirability will be rewarded.