question: but how that technology worked is still today something of a mystery.
Capitalize this past sentence correctly.
A: But how that technology worked is still today something of a mystery.

question: figure 2: select scan type option
Capitalize this past sentence correctly.
A: Figure 2: Select Scan Type Option

question: visitors can go boating on the canals or relax by their banks and enjoy the reflection of modern buildings and blue skies in the water.
Capitalize this past sentence correctly.
A: Visitors can go boating on the canals or relax by their banks and enjoy the reflection of modern buildings and blue skies in the water.