RenderWindow is just a wrapper around a BrowserWindow, so you can use all the same methods like .show(), etc

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Options

When creating the RenderWindow, you may pass in extra options: 
interface RenderWindowConstructorOptions extends BrowserWindowConstructorOptions {
	layer?: number; // default: 0
	createForeground?: boolean; // default: true
	hasInput?: boolean; // default: true
	hasInputBlock?: boolean; // default: true
	hasCursorOverride?: boolean; // default: true
}
Here’s a comprehensive list of additional methods we provide on the RenderWindow:

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Layer

Manage the stacking layer of an individual window. This is the same concept as z-index in web browsers. 
getLayer(): number;
setLayer(layer: number): void;

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Input

getInput(): boolean;
setInput(input: boolean): void;

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Input Block

Blocks input to the window 
getInputBlock(): boolean;
setInputBlock(input: boolean): void;

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Cursor Override

Forces the cursor to show when over the window 
getCursorOverride(): boolean;
setCursorOverride(input: boolean): void;