その話は置いといてって英語でなんて言うの？

Using these phrases are other good ways to politely express your desire to return to the main points of the conversation.

Although "why don't we talk about something else now" is sounds optional, almost every person you speak with would recognize this as a polite request that they must follow.

"Let's change the subject" means it's time to talk about something else.

Not comfortable in this case means you emotionally do not like the subject.

1. This is an invitation to talk about something different.
2. We had better.. = it is the beat option to...
3. You make an appropriate comment about what you have been speaking about eg. ''great,' or 'brilliant,' and immediately move the subject to safer ground by talking about something mundane.

Change the subject - talk about another topic
Talk about something else - talk about anything but not that topic
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Example : Anyway, let's change the subject.
John had decided he wanted to change the subject.
Please can we finally talk about something else, now?

Any of these sentences are appropriate:-

1. Let's not talk about that now

2. I'd rather not comment on that
   "I'd rather not" is another way of saying " I would prefer not to".

3. Let's not raise that issue.

   Any of these sentences will let the speaker know that you don't want to talk about that subject.