Where should I hint the existance of a settings drawer?

Question

I am developing an android app. I have a fragment where I display incoming data from a device in a chart, I also show information at the bottom of the fragment (extended version of a "chart legend"). But I also want to provide settings to customize that chart - and I don't know where to put them.

My idea was to show a drawer on the right side which contains the settings. I like that idea - but how can I tell my user that the settings are there? I added an menu settings icon to open and close the drawer without swiping (the chart is also "swipeable"/scalable).
Ideas:

1. I can show them that there are settings the first time they arrive on said fragment - but it is likely that I do have multiple users which interact with the app. So User 1 knows about the settings, User 2 doesn't.
2. Let the drawer "peek" - show a small bit of it everytime. The shown part could either be the "plain drawer" or something like a rectangle with an arrow depending on whether the drawer is opened or not.

And also, does that drawer fall under "good design"/"good ux"/material design guidelines?

Closed drawer:

Opened drawer:

Answer 1

The shown designs have the disadvantage that the settings dialog covers the chart. Therefore it is not possible to update the graph immediately - while the user is editing the settings.

You could instead attach a collapsable section below (or maybe above) the chart. The heading and the collapse arrow could be designed unobtrusive, but clearly visible. On click, the section rolls out, pushing down or overlapping the legend section.

^{download bmml source – Wireframes created with Balsamiq Mockups}

Answer 2

You can use the dialogue component instead of right drawer which might be difficult to discover in first time.

you can follow google's material design style. something like this:

there will be a settings button on the right side of screen which is most accessible to user, on clicking this you can open settings dialogue. It's just the example I have shared you can polish your UI accordingly.