To understand the ‘Sabbath’, you need to step back, and take in the ‘wider picture’. The Sabbath came from Genesis, pre-fall.
GEN 2:3 And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made.
Later at Sinai, the Israelites received the Law. The Law is spiritual - but was given to man who was ‘flesh’, that is, could only live in the ‘flesh’, because via Adam, man was/is spiritually ‘dead’ (separated from God).
ROM 7:14 For we know that the law is spiritual: but I am carnal, [snip]
(Both ‘carnal’ and ‘flesh’ come from the same Greek source[sarx])
So, man then needed to ‘keep’ the sabbath ‘in the flesh’, that is, man needed to ‘do’ something to keep it. Be ‘seen’ to rest,by not doing anything on ‘a’ day.
But, the meaning/intent of ‘doing nothing’ was to show that on that day/year/jubilee ‘he’(man) was resting (in God), letting God be the provider/source for that ‘sabbath’.
But, after being ‘reborn’, man, a ‘new creation’, now had a living spirit, so now the sabbath can be fulfilled ‘spiritually’. This only works by faith. Now, as James says, this ‘faith’ will be evidenced, be ‘seen’ or be visible to others - in some way, but not necessarily ‘legalistically’. You now don’t ‘do’ something just so you (or ‘others’, i.e. ‘be seen’.) can ‘tick’a box.
COL 2:16 Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:
Now reminder, the sabbath is a ‘rest’, you ‘rest’ in the finished work of Jesus. And, you do this by/in faith. So this means you can’t get an answer in respect to ‘sabbath keeping’ that is going to be able to apply to everyone - because faith is dealing with ‘things’ that can’t be ‘seen’.
The point is, these questions you are posting regarding the ‘sabbath’ are going to be difficult to answer, unless you drop back to a legalistic position - but - as per Colossians 2:16, Paul says not to do this.
To understand how the sabbath applies to us, you can read Hebrews 4, but as that interpretation is ‘spiritual’, it won’t always make too much sense to our natural reasoning.