Although Blender 2.8 has made some changes to the way selection focus works many of the older features are still available but are referenced in a different way or given a different name. View All and View Selected are two such features.
Design note: displaying a scenes contents or focusing on selected items within differ slightly to Align View (Centre View) and the various Snap and Snapping options although that can be used in similar ways.
In Blender 2.8+ View All still functions exactly the same way but is now called Frame All. In other words, when selecting the option everything in a Scene, including those off-screen, are pulled into view regardless as to whether they are selected or not. To do this, in the 3D View access the View menu and select Frame All – View » Frame All. Alternatively press the Home key.
Design note: typically used in Object Mode and Edit Mode, Frame All is available to the main interaction modes – Sculpt Mode, Texture Paint, Vertex Paint etc. – Frame All does not require object or element selections to function as its viewport (scene) based.
For Blender 2.8 View All, the feature that displays the entire contents of a scene, is now called Frame All. To use, in the 3D View select View » Frame All (or press Home) – everything in the open scene will be pulled in to view.
Frame All is also available to all the main Interaction Modes – Object Mode, Edit Mode, Sculpt Mode, Vertex Paint and Texture Paint – accessible from the View menu in the 3D View (mesh selection shown in Edit Mode whilst scene contents are entirely visible).
For Blender 2.8+ View Selected similarly still functions as before but is now referred to as Frame Selected. In other words, when used the selected object (Object Mode et al) or element/s (Edit Mode) will be pulled into view and centred on-screen. To do this, in the 3D View make a selection and click the View menu, from the list of options select Frame Selected – View » Frame Selected. Alternatively press Numpad . (period).
Design note: Frame Selected is available to all Interaction Modes and generally requires an object or element to be actively selected.
Walk-through showing use of Frame All and Frame Selected in Object Mode and Edit Mode.
Using Frame All and Frame Selected in Blender 2.8+ (previously View All and View Selected).