Using the Built-in Dictionary Tool

First, you need to install the mecab word segmentation tool.
In the dictionary settings, activate any number of preferred dictionaries. For the offline dictionary MDict, a quick download button is also provided in the resource download section.
At the bottom, select any method to trigger word lookup.

Among them, hovering the mouse will trigger the lookup when the mouse hovers over a word, while clicking the word will trigger the lookup only when the word is clicked.

Both trigger methods can also be set to require a keyboard key press, meaning that when the above mouse actions are detected, a specified key must also be pressed simultaneously to trigger the lookup.

In a small window means the lookup results will be displayed in a smaller pop-up window, otherwise, a larger full window will be used to display the results.
The effect is as follows, with the former being the style of lookup in a small window.